Alien Comet or Spaceship? Harvard Scientist Questions 2I/Borisov

① 🪝 Impression Hook

A cosmic impostor—neither comet nor asteroid—could be an alien craft cloaked as space debris, sailing toward Earth like a whisper from the stars.

② 🗺️ Schema Map (30-second overview)

🔑 Point A — Harvard scientist Avi Loeb proposes that interstellar object 2I/Borisov may not be a natural comet.
📈 Point B — Unusual trajectory and composition suggest it could be artificial, possibly a lightsail or alien probe.
📉 Point C — Scientific skepticism persists, but Loeb urges serious inquiry into non-terrestrial technology.
🌐 Point D — If confirmed, it would be humanity’s first contact with extraterrestrial engineering.

TL;DR: A Harvard scientist says a comet-like object might be an alien spacecraft approaching Earth.

③ 🧩 Triple-Chunk Core

Chunk 1 – What happened
In 2019, astronomers detected 2I/Borisov, the second known interstellar object passing through our solar system. Unlike most comets, its speed and path suggest it originated beyond our stellar neighborhood.

Chunk 2 – Impact
Harvard’s Prof. Avi Loeb argues its behavior doesn’t fully align with natural comets. He suggests it might be a functional or derelict alien lightsail—technology propelled by starlight—possibly sent intentionally toward Earth.

Chunk 3 – Insight
While mainstream science remains cautious, Loeb insists we must consider non-natural origins for unexplained objects. Dismissing anomalies risks missing revolutionary discoveries in the search for intelligent life.

④ 📚 Glossary

2I/Borisov — The first confirmed interstellar comet, discovered in 2019, exhibiting odd outgassing and velocity traits.
Lightsail — A thin, reflective propulsion system pushed by stellar radiation, theorized for deep-space travel.

⑤ 🔄 Micro-Recall

Q1: Who proposed the alien spacecraft theory for 2I/Borisov?
A1: Professor Avi Loeb of Harvard University.

Q2: Why is 2I/Borisov considered unusual?
A2: Its trajectory, speed, and composition differ from typical comets, raising questions about its origin.

Q3: What kind of technology might explain it?
A3: A lightsail—artificial, thin, and driven by light pressure, possibly of extraterrestrial design.

⑥ 🚀 Action Anchor

for space research and policy decision makers：
1️⃣ Fund dedicated telescopes to monitor interstellar visitors in real time.
2️⃣ Establish protocols for identifying artificial signatures in space objects.
3️⃣ Support interdisciplinary studies blending astronomy and SETI for anomaly investigation.
The next visitor may not wait for us to be ready.